boilers

Help, I need a new boiler and quickly before the winter weather returns. Can anyone recommend an honest reliable plumber/boiler installer in the area? They have to be CORGI registered. I'm also interested in the Green Boiler Scheme, has anyone had any experience with this?
While I'm at it I might as well ask about good and inexpensive carpenters as well to build shelves - I know it is almost a contradiction in terms 'good and inexpensive' but I live in hope!
Cheers!

Whatever you do, avoid pimlioco plumbers. I was told they would guarantee a price of ~2.2K + VAT for a boiler and installation. In the end I paid half that for a top-end German-made boiler, cash in hand. Get a Vaillant, collect quotes - and avoid Pimlico.